Introduction of Molecular Methods into a Food Microbiology Curriculum     

Aaron M. Pleitner  Susan R. Hammons  Emily McKenzie  Young‐Hee Cho  Haley F. Oliver 《Journal of Food Science Education》2014,13(4):68-76

Maintaining current, relevant curriculum in undergraduate Food Microbiology courses is essential for training future experts in food quality and safety. Having an understanding of the fundamental techniques (for example, polymerase chain reaction [PCR]) that are used in the food industry and regulatory agencies is critical for students entering the workforce. The purpose of this study was to assess the efficacy of integrating molecular methods into an undergraduate Food Microbiology course in both lecture and laboratory settings. Modules on PCR and pulsed‐field gel electrophoresis (PFGE), both of which are currently used by government agencies and the food industry to investigate the presence and persistence of foodborne pathogens, were developed, introduced, and evaluated among 269 students over 4 y. Multiple teaching and learning styles were incorporated through (i) traditional lecture format on the basics of PCR and PFGE; (ii) hands‐on group activities to build upon the lecture instruction; (iii) performing PCR and PFGE in the laboratory; and (iv) group discussions to analyze results from laboratory exercises. Pre‐ and postinstruction evaluations revealed significant increases in understanding and application of both methods in lecture and laboratory settings as demonstrated by 0.60 and 0.51 mean normalized gains for respective PCR and PFGE lectures and 0.50 and 0.56 mean normalized gains in respective labs. Academic year significantly impacted score improvement, potentially due to hidden factors, such as previous exposure to material and student aptitude. This study provides the platform for successful introduction of molecular techniques in an undergraduate Food Microbiology course. The guidelines and materials developed by our group are publicly available for use by other institutions.  相似文献   

Parameter selection of pocket extraction algorithm using interaction interface     

KIM Chong-Min WON Chung-In RYU Joonghyun CHO Cheol-Hyung BHAK Jonghwa KIM Deok-Soo 《浙江大学学报(A卷英文版)》2006,7(9):1492-1499

INTRODUCTION Being the bio era, a significant research effort has been devoted to the study of proteins since they are related to the critical body functions. There have been many studies on proteins, with the voluminous related data being currently available in various pub- lic repositories including the Protein Data Bank (PDB) (CATH, 2006; DALI, 2006; MSD, 2006; RCSB PDB, 2006; SCOP Database, 2006). Given the atomic complexes of proteins, ana- lyzing interactions between them…  相似文献   

Sublexical and lexical processing of the English orthography among native speakers of Chinese and Korean     

Hye K. Pae  Sun-A Kim  Quintino R. Mano  Yeon-Jin Kwon 《Reading and writing》2017,30(1):1-24

Comparisons of the effects of typical and atypical typeface on reading performance among readers of different linguistic backgrounds may yield new insights into the psychology of word recognition. A total of 143 adults (i.e., 50 Chinese, 55 Koreans, 38 native English speakers) participated in the study that involved two computer-based naming tests. The tests presented words with letters that varied in size and shape in Experiment 1 and words containing scrambled letters in Experiment 2. Results from Experiment 1 showed that the interference effect of size and shape on word naming accuracy and latency was robust for all readers. Likewise, results from Experiment 2 showed a broad interference effect of scrambled letters on word naming; however, scrambled letters appeared less disruptive to word naming among Chinese readers compared to their Korean and native English speaking counterparts. Taken together, Chinese speakers were less efficient in recognizing atypical words at the sublexical level, but more efficient at the lexical level.  相似文献   

Examining the Effectiveness of a Professional Development Program: Integration of Educational Robotics into Science and Mathematics Curricula     

You  Hye Sun  Chacko  Sonia Mary  Kapila  Vikram 《Journal of Science Education and Technology》2021,30(4):567-581

Journal of Science Education and Technology - This study describes a professional development (PD) program designed to support middle school teachers in effectively integrating robotics in science...  相似文献   

高效光伏电池     

DanielCho柯江华  杨光 《科学中国》2003,(11):10-10

在没有阳光照亮的地方，请采用更好的背接触式太阳能电池。  相似文献   

Exploring the parallelism between change in students' conceptions and historical change in the concept of inertia     

Dr Jinwoong Song  Sook-Kyoung Cho  Byung-Hoon Chung 《Research in Science Education》1997,27(1):87-100

This study investigates students' conceptions of inertia and compares these conceptions with historical change in the concept. A total of 736 students from four different age groups (i.e., age 11, 13, 15 and 17) participated in the survey. Questions in the questionnaire represent problems related to the concept of inertia which have been argued by past scientists such as Aristotle, Buridan, Galileo, and Newton. The questionnaire contained three questions, each concerned with one of the following applications of inertia: natural motion, the motion of a flying spear, and the falling motion of a stone on a moving ship. The results of the survey showed that there were considerable similarities as well as dissimilarities between students' conceptions and the views of past scientists. It is suggested that this kind of comparison studies would give useful background information on change in students' conceptions. To this day every student of elementary physics has to struggle with the same errors and misconceptions which then had to be overcome, and on a reduced scale, in the teaching of this branch of knowledge in schools, history repeats itself every year. (Dijksterhuis, 1961, p. 30)  相似文献   

A Web-based on-machine mould matching and measurement system based on CAD/CAM/CAI integration     

CHOI Jin-hwa JEON Byung-cheol KIM Gun-hee SHIN Bong-cheol LEE Honghee CHO Myeong-woo SEONG Eun-je PARK Dong-sam 《浙江大学学报(A卷英文版)》2006,7(9):1474-1481

INTRODUCTION Today, the manufacturing industry makes con- stant effort in order to construct an E-manufacturing system using information technology for effective production control, and then, it offers the integrated production control to the workers, the production managers, and the consumers, etc. (Lee, 2003; Choi, 2004). In the mould manufacturing industry, the process managers often request paperwork to know the information of the processes on CNC machine tools or they visit the shop…  相似文献   

Exploring Elementary Pre-service Teachers’ Beliefs About Science Teaching and Learning as Revealed in Their Metaphor Writing     

Eulsun Seung  Soonhye Park  Ratna Narayan 《Journal of Science Education and Technology》2011,20(6):703-714

This study examined elementary preservice teachers’ beliefs about the role/image of a science teacher and science teaching and how these beliefs change during an elementary science methods course; this examination was conducted through an analysis of their metaphor writing. Data included personal metaphors and rationale papers for supporting them collected from 106 participants at the start and end of the semester. Data were analyzed using the constant comparative method and also quantified for statistical analysis. Results indicate that most participants came to the course with traditional views and developed more constructivist views during the course. However, they tended to keep their traditional views and added new constructivist perspectives into their original belief systems. This study suggests that metaphor writing can be used as both a reflection tool for preservice teachers to clarify and refine their beliefs about science teaching and learning and a diagnostic assessment tool for teacher educators to understand their students for tailoring a methods course accordingly.  相似文献   

Foundational Concepts for Conducting Program Evaluations     

Seung Youn Chyung 《Performance Improvement Quarterly》2015,27(4):77-96

Evaluation is one of the critical steps in the process of performance improvement. Evaluation feeds evidence‐based information back to the next cycle of performance improvement. However, organizations often neglect to conduct comprehensive evaluations on their programs due to environmental barriers or the lack of practitioners’ evaluation expertise. This article presents some of the foundational evaluation‐related concepts and procedures that would help human performance improvement practitioners when conducting comprehensive systematic and systemic evaluations of the interventions implemented in organizations: (a) evaluation versus research, (b) front‐end evaluation versus back‐end evaluation, (c) definition of program evaluation, (d) types of program stakeholders, (e) development of program logic models, (f) formative evaluation versus summative evaluation, (g) merit versus worth, and (h) development of evaluation dimensions. Such foundational knowledge is just one of the first steps to prevent evaluations from being neglected or mistaken with simple measurements through administering instruments such as smiley sheets.  相似文献   

Foot and ankle joint movements of dancers and non-dancers: a comparative study     

Ho-Jung Cho  Soyeon Kim  Joon-Yong Jung 《Sports biomechanics / International Society of Biomechanics in Sports》2013,12(6):587-594

Ballerinas use their ankle joints more extremely and sustain injuries on the ankle joint more frequently than non-dancers. Therefore, the ankle movement of dancers is important and should be studied to prevent injuries. Measuring ankle joint range of motion (ROM) using radiographs could demonstrate the contribution to motion of each joint. The aim of this study was to analyse and compare ankle joint movements and the ratio of each joint’s contribution during movement between dancers and non-dancers, using radiographic images. Dancers have lower dorsiflexion (26.7 ± 6.2°), higher plantarflexion (74.3 ± 7.1°) and higher total (101.1 ± 10.8°) ROMs than non-dancers (33.9 ± 7.0°, 57.2 ± 6.8° and 91.1 ± 9.3°, respectively) (p < 0.05). Although the ROMs were different between the two groups, the ratios of each joint movement were similar between these two groups, in all movements. Regarding total movement, the movement ratio of the talocrural joint was almost 70% and other joints accounted for almost 30% of the movement role in both dancers and non-dancers. Therefore, the differences in ROM between dancers and non-dancers were not a result of a specific joint movement but of all the relevant joints’ collaborative movement.  相似文献